Airtac SCJ50 Standard Cylinder SCJ50X400-50S
The AirTAC Airtac SCJ50 Standard Cylinder SCJ50X400-50S is a genuine double-acting SINGLE-ROD air cylinder with a rear-cap ADJUSTING SCREW: the stroke end is field-adjustable within a 50 mm range without swapping the cylinder. Ø50mm bore, 400mm nominal stroke, PT1/4 ports and adjustable end cushioning.
- BoreØ50 mm
- Nominal stroke400 mm
- Stroke adjust-50 mm
- Port sizePT1/4
- Rod threadM16×1.5
- CushionAdjustable, 21 mm
About the Airtac SCJ50 Standard Cylinder SCJ50X400-50S
The SCJ50X400-50S is a double-acting, single-rod pneumatic cylinder with a 50 mm bore and a nominal 400 mm stroke, featuring a rear-cap adjusting screw that provides up to 50 mm of field-adjustable stroke-end reduction. This model includes a built-in magnet (-S suffix), allowing direct mounting of CMSG, DMSG, or EMSG sensors along the tie-rod barrel for reliable end-of-stroke or mid-position sensing. With a 20 mm diameter piston rod and PT1/4 ports, it delivers 982 N of push force at 0.5 MPa, scaling to 1767 N at the maximum operating pressure of 0.9 MPa.
Designed for applications where the retract stroke end must be fine-tuned on the machine, the adjusting screw allows operators to dial in the exact stopping position without swapping the cylinder or adding external hard stops. The body length A(SCJ) is 194 mm, and the cylinder uses a resilient TPU seal as standard, rated for an ambient and media temperature range of -20 to +70 °C. The adjustable air cushion at both ends decelerates the piston smoothly, protecting the end caps during high-cycle operation.
Airtac SCJ50 Standard Cylinder SCJ50X400-50S Technical Specifications
| Model | Airtac SCJ50 Standard Cylinder SCJ50X400-50S |
|---|---|
| Series | SCJ adjustable-stroke tie-rod cylinder |
| Bore size | Ø50 mm |
| Nominal stroke | 400 mm |
| Stroke adjustment | Up to 50 mm (rear adjusting screw) |
| Acting type | Double acting (single rod) |
| Port size | PT1/4 |
| Rod thread | M16×1.5 |
| Fluid | Air (filtered by 40µm element) |
|---|---|
| Operating pressure | 0.15 – 1.0 MPa |
| Proof pressure | 1.5 MPa |
| Temperature | -20 to +70 °C |
| Speed range | 30 – 800 mm/s |
| Cushion | Adjustable, 21 mm |
| Max stroke | Up to 1200 mm |
Specifications follow the official AirTAC SCJ (adjustable-stroke) datasheet. The rear adjusting screw sets the stroke end position; force is the same as the equivalent single-rod SC bore. Confirm against the product label before installation. Thread options: PT (standard) / G.
Theoretical Output Force (Ø50mm)
| Pressure | Push force | Pull force |
|---|---|---|
| 0.5 MPa | 982 N | 825 N |
| 0.7 MPa | 1374 N | — |
| Max (@1.0 MPa) | 200 kgf | |
SCJ is single-rod, so force matches the equivalent SC bore: push uses the full bore area, pull subtracts the rod area. Actual usable force is lower than theoretical due to friction and back-pressure; size with a safety margin.
Model Code: Airtac SCJ50 Standard Cylinder SCJ50X400-50S
| SCJ | Adjustable-stroke tie-rod cylinder series. |
|---|---|
| 50 | Bore size in mm. |
| ×400 | Nominal (maximum) stroke length in mm. |
| -50 | Adjustable-stroke range in mm (options 10/20/30/40/50/75/100). |
| -S | Optional built-in magnet for sensor position sensing. |
Related types: SC (single rod, fixed stroke), SCD (double rod), SCT (multi-position). SCJ mounting: Basic, FA, LB, TC, TCM1. Seals: TPU standard / H = Viton / N = NBR. Thread: blank = PT, G = G thread.
Where the Airtac SCJ50 Standard Cylinder SCJ50X400-50S Is Used
Commissioning & Setup
Fine-tune the retract end position by up to 50 mm during initial machine setup to perfectly align tooling or stops without re-plumbing or changing the cylinder.
Wear Compensation
Adjust the stroke end to take up mechanical wear on conveyor stops or clamps, maintaining precise positioning over the machine's life without downtime for part replacement.
Format Changeover
Quickly adapt the cylinder's retract stroke for different product sizes on a packaging or assembly line by turning the rear adjusting screw, eliminating the need for multiple cylinder models.
Is the Airtac SCJ50 Standard Cylinder SCJ50X400-50S the Right Cylinder?
Choose the SCJ50 when you need a mid-range force actuator with the ability to tweak the retract stroke end during commissioning or format changes. If your load requires more force, stepping up to the SCJ63 bore provides 1559 N of push at 0.5 MPa. For applications where the stroke is fixed and never needs adjustment, the standard SC50 fixed-stroke cylinder is a simpler, more cost-effective alternative. For a direct replacement, match an AirTAC SCJ adjustable-stroke cylinder with the same 50 mm bore, 400 mm nominal stroke, 50 mm adjust range, PT port thread, and the -S magnet option. At a 400 mm stroke, be mindful of side loads on the 20 mm rod; if the load is not guided externally, consider adding an external guide rail or switching to a guided cylinder to prevent rod bending and premature seal wear.
Adjustable-stroke checklist
- ✓ Need to fine-tune stroke on the line?
- ✓ Nominal stroke + adjust range (-50)
- ✓ Required force at your working pressure
- ✓ Port/thread type (PT/NPT/G)
- ✓ Magnet (-S) for sensors?
Installation & Maintenance Notes
- check Use clean air filtered to 40µm or finer.
- check Keep within 0.15 – 1.0 MPa operating pressure.
- check Set the rear adjusting screw, then lock it before running.
- check Adjust end cushion screws for smooth stops.
- check Use SCJ mounting accessory (FA / LB / TC / TCM1).
- check Installation by qualified personnel per AirTAC docs.
Airtac SCJ50 Standard Cylinder SCJ50X400-50S FAQ
At 0.5 MPa, the push force is 982 N and the pull force is 825 N. At the maximum operating pressure of 0.9 MPa, the push force increases to 1767 N. The pull force is lower due to the area of the 20 mm piston rod.
Yes, if you need the ability to adjust the stroke end. The SCJ50X400-50S shares the same bore, port size, and mounting accessories as the SC50. Ensure the 50 mm adjust range is sufficient for your application and that you account for the slightly longer body length of the adjustable version.
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